CN102105417A - Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same - Google Patents
Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same Download PDFInfo
- Publication number
- CN102105417A CN102105417A CN2009801294442A CN200980129444A CN102105417A CN 102105417 A CN102105417 A CN 102105417A CN 2009801294442 A CN2009801294442 A CN 2009801294442A CN 200980129444 A CN200980129444 A CN 200980129444A CN 102105417 A CN102105417 A CN 102105417A
- Authority
- CN
- China
- Prior art keywords
- oxide
- spinel ferrite
- nickel manganese
- nickel
- manganese cobalt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/006—Compounds containing, besides nickel, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
- C01G49/0072—Mixed oxides or hydroxides containing manganese
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G51/00—Compounds of cobalt
- C01G51/006—Compounds containing, besides cobalt, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62655—Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62675—Thermal treatment of powders or mixtures thereof other than sintering characterised by the treatment temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/30—Three-dimensional structures
- C01P2002/32—Three-dimensional structures spinel-type (AB2O4)
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3262—Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3275—Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite
- C04B2235/3277—Co3O4
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3279—Nickel oxides, nickalates, or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5445—Particle size related information expressed by the size of the particles or aggregates thereof submicron sized, i.e. from 0,1 to 1 micron
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
- C04B2235/762—Cubic symmetry, e.g. beta-SiC
- C04B2235/763—Spinel structure AB2O4
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Magnetic Ceramics (AREA)
- Compounds Of Iron (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The present invention relates to a method for producing spinel ferrite having a low permeation loss and a low dielectric loss which can be widely used as a material for high frequency (MHz) electronic components, and to spinel ferrite produced by the method. The method for producing spinel ferrite according to the present invention includes the steps of: preparing nickel oxide, cobalt oxide, manganese oxide, and iron oxide; wet-mixing the nickel oxide, cobalt oxide, manganese oxide, and iron oxide in methanol; taking powders from the mixture of nickel oxide, cobalt oxide, manganese oxide, and iron oxide, and drying the powders; crushing the dried powders; and heat-treating the powders, thereby producing nickel manganese cobalt spinel ferrite having a low permeation loss and a low dielectric loss.; The nickel manganese cobalt spinel ferrite produced in accordance with the method of the present invention can be widely used as a material for radiofrequency electronic components. The nickel manganese cobalt spinel ferrite produced in accordance with the method of the present invention and applied to an antenna may shorten the length of the antenna and improve the bandwidth, efficiency, and performance of the antenna.
Description
Technical field
The present invention relates to ferrite manufacture method and the ferrite made of method thus, relate in particular to and have low saturating magnetic loss and the low nickel manganese cobalt spinel ferrite manufacture method of electric losses and the nickel manganese cobalt spinel ferrite made of method thus of luring.
Background technology
Ferrite (ferrite) is to dissolve the sosoloid that alloying element or impurity form below 900 ℃ on stable body-centered cubic crystalline iron.Being the term on the iron and steel metallography, is to be the sosoloid of substrate with α iron, though therefore outward appearance is the same with pure iron, the element term of quoting institute's solid solution is called silicon ferrite or ferro-silicon.See it is single-phase at microscopically, and dissolve the partially mixed expression of pearlite of the ferritic white portion and the black of some carbon.Ferrite uses on the magnetic head of high-frequency transformer, cartridge, tape recorder and so on etc.
The common conduct of spinel ferrite in this ferrite (spinel ferrite) is at EMC iron core (EMC core), the high inductance Gong Naruto of low output loop, the material that uses on the low frequency fields such as wide band transformer, on the high frequency field more than the MHz,, use mainly as cartridge owing to high saturating magnetic loss.
Concrete, the spinel ferrite has high magnetic susceptibility below the MHz frequency, but also can have high saturating magnetic loss thus.Because such characteristic is suitable for difficulty because high loss exists on RF electrical fittings material, therefore use mainly as cartridge.
Such spinel ferrite manufacture method has the manufacturing by ball milling (ball mill), by precipitation (altogether Shen), by the manufacturing of, sol-gel (sol-gel), hydrothermal synthesis method etc.
Sol-gel be meant comprise from mobile gel to a series of process that embodies the colloidal sol transfer process of viscoelastic property like the semisolid, hydrothermal synthesis method is meant a metal-salt, oxide compound, oxyhydroxide or metal-powder under solution state or suspension state, utilize material interdependent characteristic is synthesized or enlarge the crystalline method by the concentration of solubleness, temperature, pressure and solvent.When coprecipitation was meant on the solution of similar two materials of chemical property coexistence any one species precipitate, another material is the phenomenon of coprecipitation also.
But the ferritic synthesis condition of spinel by sol-gel or hydrothermal method manufacturing is to need to adjust temperature, pressure, PH etc., thereby there are the problem of mass production difficulty thus in reproducibility and manufacture method harshness.
In addition, utilize coprecipitation to make the ferritic method of spinel compared with sol-gel, hydrothermal synthesis method possesses simple manufacturing process, therefore have and to be used for mass-produced advantage, but a large amount of waste water and waste take place in washing process, and the shared mass ratio of metal is low in as the metal-salt of making raw material, thereby has the high shortcoming of manufacturing cost.
Summary of the invention
Thereby, the objective of the invention is to guarantee that in order upward to be suitable at high frequency (more than the MHz), to provide low saturating magnetic loss and the low nickel manganese cobalt spinel ferrite manufacture method of electric losses that lures reach the nickel manganese cobalt spinel ferrite of method manufacturing thus as the electrical fittings material.
In addition, the object of the present invention is to provide manufacturing process simple and can fully guarantee the nickel manganese cobalt spinel ferrite manufacture method of reproducibility and the nickel manganese cobalt spinel ferrite made of method thus.
In addition, but another object of the present invention is to provide the not high nickel manganese cobalt spinel ferrite manufacture method of mass production and manufacturing cost and method and the nickel manganese cobalt spinel ferrite made thus.
Nickel manganese cobalt spinel ferrite manufacture method according to the present invention comprises the step that nickel oxide (NiO), cobalt oxide (Co3O4), manganese oxide (MnO) and ferric oxide (Fe2O3) are provided; Humidification mixes above-mentioned nickel oxide on methyl alcohol, above-mentioned cobalt oxide, the step of above-mentioned manganese oxide and above-mentioned ferric oxide; At above-mentioned nickel oxide, above-mentioned cobalt oxide takes out powder and the exsiccant step on above-mentioned manganese oxide and the above-mentioned ferric oxide mixture; Pulverize the step of above-mentioned exsiccant powder; And with the heat treated step of the powder of above-mentioned pulverizing.
The above-mentioned nickel oxide that provides, cobalt oxide, the step of manganese oxide and ferric oxide is with nickel oxide, cobalt oxide, manganese oxide and ferric oxide are respectively with 0.6～0.8: 0.005～0.007: 0.052～0.054: 1.04～1.06 mole (mol) is than being provided as feature, preferably, above-mentioned mol ratio can be with 0.7: 0.006: 0.053: 1.05 mol ratio provides.
The above-mentioned nickel oxide that provides, cobalt oxide, manganese oxide and ferric oxide step are with nickel oxide, cobalt oxide, manganese oxide and ferric oxide are with 0.6～0.8: 0.005～0.007: 0.057～0.059: 1.13～1.15 mole (mol) is than being provided as feature, preferably, above-mentioned mol ratio can be with 0.76: 0.006: 0.058: 1.14 mol ratio provides.
Above-mentioned humidification blended step was carried out 45 hours to 50 hours with ball milling (ball mill), preferably, carried out about 48 hours.
The step of above-mentioned dry mixed powder is carried out 11 hours to person 13 hours under 110 ℃ to 130 ℃ conditions, preferably, carried out 12 hours under 120 ℃ of conditions.
In the above-mentioned heat treatment step, thermal treatment for the first time is to carry out on 750 ℃ to 850 ℃, preferably, carries out on about 800 ℃.
Thermal treatment for the second time is to carry out on 1150 ℃ to 1250 ℃ after the above-mentioned thermal treatment first time, preferably, carries out on about 1200 ℃.
Thermal treatment for the second time is to carry out on 1050 ℃ to 1150 ℃ after the above-mentioned thermal treatment first time, and the best is to carry out on about 1100 ℃.
Thermal treatment for the third time is to carry out on 1200 ℃ to 1300 ℃ after the above-mentioned thermal treatment second time, preferably, carries out on about 1250 ℃.
Thermal treatment for the third time is to carry out on 1100 ℃ to 1200 ℃ after the above-mentioned thermal treatment second time, preferably, carries out on about 1150 ℃.
In addition, nickel manganese cobalt spinel ferrite according to the present invention is to be fabricated to feature according to above-mentioned manufacture method.
According to nickel manganese cobalt spinel ferrite manufacture method of the present invention and thus the nickel manganese cobalt spinel ferrite of method manufacturing have low saturating magnetic loss and the low electric losses that lures, therefore have on high frequency also the effect that can be suitable for as the electrical fittings material.
In addition, according to nickel manganese cobalt spinel ferrite manufacture method of the present invention and thus the nickel manganese cobalt spinel ferrite of method manufacturing have the effect that manufacturing process not only simply and fully guarantees reproducibility.
In addition, according to nickel manganese cobalt spinel ferrite manufacture method of the present invention and thus the nickel manganese cobalt spinel ferrite of method manufacturing have not only can mass production and the not high effect of manufacturing cost.
Description of drawings
Fig. 1 is the block diagram of expression according to the ferritic manufacture method of nickel manganese cobalt spinel of the present invention.
Fig. 2 is the block diagram of expression according to the ferritic manufacture method of nickel manganese cobalt spinel of first embodiment of the invention.
Fig. 3 is the chart of expression according to the compound permitivity variation of nickel manganese cobalt spinel ferrite in band territory between the 10MHz to 1GHz of first embodiment of the invention.
Fig. 4 is the chart of expression according to the compound magnetic susceptibility variation of nickel manganese cobalt spinel ferrite in band territory between the 10MHz to 1GHz of first embodiment of the invention.
Fig. 5 is that expression is suitable for the chart according to the performance of the antenna of the material of the ferritic antenna of nickel manganese cobalt spinel of first embodiment of the invention and suitable permitivity 40.
Fig. 6 is that expression is suitable for the form according to the performance of the antenna of the material of the ferritic antenna of nickel manganese cobalt spinel of first embodiment of the invention and suitable permitivity 40.
Fig. 7 is the block diagram of expression according to the ferritic manufacture method of nickel manganese cobalt spinel of second embodiment of the invention.
Fig. 8 is the chart of expression according to the variation of nickel manganese cobalt spinel ferrite compound (complex) magnetic susceptibility in the band territory between the 100MHz to 400MHz of second embodiment of the invention.
Embodiment
Describe most preferred embodiment of the present invention with reference to the accompanying drawings in detail, but the present invention does not limit or is defined as embodiment.As reference, the same in fact key element of prosign indication in the present invention, and illustrate can quoting the content of putting down in writing on other drawing under the above-mentioned rule, will omit in this content self-evident or repeatedly concerning the practitioner of the technical field of the invention.
Fig. 1 is the block diagram of expression according to nickel manganese cobalt spinel ferrite manufacture method of the present invention.
With reference to Fig. 1, nickel manganese cobalt spinel ferrite manufacture method of the present invention comprises provides nickel oxide, cobalt oxide, manganese oxide, the step of ferric oxide (S110); These are used ball milling humidification blended step (S120) in methyl alcohol; In mixture, take out powder and exsiccant step (S130); The step of crushed after being dried (S140); And powder step of heat treatment (S150) to pulverizing.
Specific embodiment to this is as follows.
Fig. 2 is the block diagram of expression according to the nickel manganese cobalt spinel ferrite manufacture method of first embodiment of the invention.
In order to provide nickel manganese cobalt spinel ferrite, nickel oxide, cobalt oxide, manganese oxide and ferric oxide according to first embodiment of the invention respectively with about 0.7: 0.006: 0.053: 1.05 mol ratio (mol) weighing provides (S210).
With ball milling (ball mill) these nickel oxide that provide, cobalt oxide, manganese oxide and ferric oxide humidification in methyl alcohol (MeOH) is mixed about 48 hours (S220).
In this nickel oxide, cobalt oxide, manganese oxide and ferric oxide mixture, take out powder (Fen Body) dry about 12 hours (S230) in about 120 ℃.
This exsiccant powder is pulverized, made it become small-particle (S240).
The powder of above-mentioned drying and crushing will be through a heat treatment process.(S250) carried out in thermal treatment for the first time under about 800 ℃ temperature.
Through thermal treatment for the first time, thereby can further promote the thermal treatment of carrying out the afterwards second time to reach spinel ferrite synthetic process in the thermal treatment for the third time.
Through heat treated powder will be through the heat treatment process second time for the first time, (S260) carried out in thermal treatment for the second time under about 1200 ℃ temperature.
Will be through heat treated powder for the second time through heat treatment process for the third time, (S270) carried out in thermal treatment for the third time under about 1250 ℃ temperature.
During through said process, nickel oxide, cobalt oxide, manganese oxide and ferric oxide synthesize the spinel ferrite.
At this, Fig. 2 is a first embodiment of the invention, under the suitable situation of the present invention of reality, be not limited to this, the mol ratio of nickel oxide, cobalt oxide, manganese oxide and ferric oxide can be provided to 1.06 with 0.6 to 0.8: 0.005 to 0.007: 0.052 to 0.054: 1.04, the humidification mixing time can be carried out 45 hours to 50 hours, and powder is under 110 ℃ to 130 ℃ conditions, can dry about 11 hours to 13 hours.
In addition, thermal treatment for the first time can be carried out under 750 ℃ to 850 ℃, and thermal treatment for the second time can be carried out under 1150 ℃ to 1250 ℃, and thermal treatment for the third time can be carried out under 1200 ℃ to 1300 ℃.
Fig. 3 is the chart of expression according to the compound permitivity variation of nickel manganese cobalt spinel ferrite in band territory between the 10MHz to 1GHz of first embodiment of the invention manufacturing.Permitivity (permittivity) is meant that the power (Coulomb force) of the physical properties that exists between two monopoles changes the general electric constant of representing in (electricdisplacement) relevant mathematical formula with the electromagnetic nature that brings by luring electric body along with insertion in electromagnetic field, be that expression lures electric body, the i.e. characteristic value of the electrical characteristic of nonconductor.
As shown in Figure 3, under 200MHz, has the electric losses that lures below 0.0004 according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention as can be known.And permitivity is between 6 to 7.
Fig. 4 is the chart of expression according to the compound magnetic susceptibility variation of nickel manganese cobalt spinel ferrite in band territory between the 10MHz to 1GHz of first embodiment of the invention.
Magnetic susceptibility (permeability) is meant, the amount of the magnetic properties of expression material.Be meant the magneticflux-density that produces when magnetizing (magnetization) and the ratio of magneticstrength in a vacuum furtherly being subjected to influence of magnetic field.
Known to Fig. 4, be the saturating magnetic loss that under 200MHz, has below 0.04 according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention.And magnetic susceptibility is expressed the characteristic between 9 to 10.
Represent that according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention the ratio of magnetic susceptibility/permitivity is the characteristic between 1.3 to 1.75.
This nickel manganese cobalt spinel ferrite and general spinel ferrite characteristic when comparing according to first embodiment of the invention has the low-down characteristic of magnetic loss.In addition, magnetic susceptibility will be higher than permitivity.
And then, having low saturating magnetic loss and the low electric losses that lures according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention manufacture method manufacturing, therefore can be suitable for as the electrical fittings material in the high frequency field.
Concrete, can be applicable to the antenna substrate material according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention.Generally have the electric body antenna of luring of permitivity 6～7 and have about 2.65 cripetura than (ratios of the length of antenna and λ/2).In contrast, be suitable for according to the ferritic antenna of nickel manganese cobalt spinel of first embodiment of the invention because the characteristic of its high permitivity and magnetic susceptibility, have about 8.37 cripetura ratio.That is, when using nickel manganese cobalt spinel ferrite according to first embodiment of the invention as the antenna substrate material, antenna cripetura effect increases.
Fig. 5 represents to be adapted to according to the nickel manganese cobalt spinel ferrite of first embodiment of the invention as carrying out the suitable example of mimic on the antenna of one of electrical fittings.Concrete, Fig. 5 is expression will be suitable for according to the material of the ferritic antenna substrate material of first embodiment of the invention nickel manganese cobalt spinel and the permitivity 40 with same resonant frequency relatively the time, relatively the icon of resonant frequency and dB.Fig. 6 numeric representation is the form of these performancees.
The dB expression that descends downwards refers to that efficient increases in the resonant frequency field as shown in Figure 5, launches expression to the side and refers to that bandwidth (bandwidth) broadens.Known to Fig. 5, on efficient and bandwidth, has outstanding performance than the material of permitivity 40 according to the nickel manganese cobalt spinel ferritic phase of first embodiment of the invention.That is, utilize the bandwidth of the antenna of nickel manganese cobalt spinel ferrite of the present invention manufacturing to broaden as can be known and efficient also improves.In contrast, therefore the antenna of the material of suitable permitivity 40 does not look like and takes place because its resonance is very faint.
Can also confirm by Fig. 6, be suitable for that to compare the antenna of the material that is suitable for permitivity 40 with performance according to the bandwidth of the ferritic antenna of nickel manganese cobalt spinel of first embodiment of the invention outstanding, and can confirm the also outstanding characteristic of its gain (gain).
Fig. 7 is the block diagram of expression according to the nickel manganese cobalt spinel ferrite manufacture method of second embodiment of the invention.
For the nickel manganese cobalt spinel ferrite according to second embodiment of the invention is provided, nickel oxide, cobalt oxide, manganese oxide and ferric oxide are respectively with about 0.76: 0.006: 0.058: 1.14 mole (mol) provides (S710) than weighing.Preferably, at this, ferric oxide uses the ferric oxide of mean particle size less than 1 μ m.
With ball milling (ball mill) the above-mentioned nickel oxide that provides, cobalt oxide, manganese oxide and ferric oxide humidification in methyl alcohol (MeOH) is mixed about 48 hours (S720).
From this nickel oxide, cobalt oxide takes out powder (Fen Body in manganese oxide and the ferric oxide mixture), under about 120 ℃, dry about 12 hours (S730).
Pulverize exsiccant powder like this, make it become small-particle (S740).
Above-mentioned powder through drying and crushing will be through the heat treatment process first time.Thermal treatment is for the first time carried out (S750) under about 800 ℃ of temperature.
Through thermal treatment for the first time, thereby can further promote the thermal treatment of carrying out the afterwards second time to reach spinel ferrite synthetic process in the thermal treatment for the third time.
Through heat treated powder will be through the heat treatment process second time for the first time.Thermal treatment is for the second time carried out (S760) under about 1100 ℃ of temperature.
Will be through heat treated powder for the second time through heat treatment process for the third time.Thermal treatment is for the third time carried out (S770) under about 1150 ℃ of temperature.
Through said process, nickel oxide, cobalt oxide, manganese oxide and ferric oxide synthesize the spinel ferrite.
At this, Fig. 7 is a second embodiment of the invention, when reality is suitable of the present invention, be not limited thereto, the mol ratio of nickel oxide, cobalt oxide, manganese oxide and ferric oxide provided to 1.15 with 0.6 to 0.8: 0.005 to 0.007: 0.057 to 0.059: 1.13 respectively, the humidification blended time of carrying out is 45 hours to 50 hours, and powder is under 110 ℃ to 130 ℃ conditions, dry 11 hours to 13 hours.
In addition, thermal treatment for the first time can be carried out under 750 ℃ to 850 ℃, and thermal treatment for the second time also can be carried out under 1050 ℃ to 1150 ℃, and thermal treatment for the third time also can be carried out under 1100 ℃ to 1200 ℃.
As mentioned above, nickel manganese cobalt spinel ferrite according to a second embodiment of the present invention, promptly different with first embodiment of the invention, the employing mol ratio is 1.13 to 1.15 ferric oxide, the thermal treatment second time is reached 100 ℃ of thermal treatment temp minimizings for the third time and the nickel manganese cobalt spinel ferrite of manufacturing, as shown in Figure 8 in the saturating magnetic loss that has on the 230MHz below 0.02.
Further, have the saturating magnetic loss that reduces more than 0.02 compared with nickel manganese cobalt spinel ferrite, when being adapted on the antenna, can increase the efficient of antenna according to first embodiment of the invention according to the nickel manganese cobalt spinel ferrite of second embodiment of the invention.At this, be to be respectively 6 to 7 and 9 to 10 according to the ferritic permitivity of nickel manganese cobalt spinel and the magnetic susceptibility of second embodiment of the invention, thus identical with ferritic permitivity of nickel manganese cobalt spinel and magnetic susceptibility according to first embodiment of the invention.
As mentioned above, be to have low saturating magnetic loss and the low electric losses that lures according to the nickel manganese cobalt spinel ferrite of the first embodiment of the present invention and second embodiment, therefore can be applicable to the electrical fittings material, the concrete antenna substrate material etc. that is applicable in the high frequency field.
To sum up, be illustrated, but should understand, can carry out various modifications and changes to the present invention in inventive concept of in not exceeding following interest field, putting down in writing and the territory the practitioner in corresponding field with reference to the preferred embodiments of the present invention.
Claims (13)
1. one kind has low saturating magnetic loss and the nickel manganese cobalt spinel ferrite manufacture method of hanging down in the spinel ferrite manufacture method that lures electric losses, it is characterized in that, comprise,
The step of nickel oxide, cobalt oxide, manganese oxide and ferric oxide is provided;
Humidification mixes the step of described nickel oxide, described cobalt oxide, described manganese oxide and described ferric oxide in methyl alcohol;
From described nickel oxide, described cobalt oxide, described manganese oxide and described ferric oxide mixture, take out powder and carry out the exsiccant step;
Pulverize the step of described exsiccant powder;
And to described powder step of heat treatment.
2. nickel manganese cobalt spinel ferrite manufacture method according to claim 1 is characterized in that, carries out repeatedly in that described powder heat is carried out thermal treatment described in the treatment step.
3. nickel manganese cobalt spinel ferrite manufacture method according to claim 2, it is characterized in that described nickel oxide, described cobalt oxide, described manganese oxide and described ferric oxide are to provide to 1.06 mol ratio with 0.6 to 0.8: 0.005 to 0.007: 0.052 to 0.054: 1.04 respectively.
4. nickel manganese cobalt spinel ferrite manufacture method according to claim 2, it is characterized in that described nickel oxide, described cobalt oxide, described manganese oxide and described ferric oxide are to provide to 1.15 mol ratio with 0.6 to 0.8: 0.005 to 0.007: 0.057 to 0.059: 1.13 respectively.
5. nickel manganese cobalt spinel ferrite manufacture method according to claim 4 is characterized in that the mean particle size of described ferric oxide is less than 1 μ m.
6. according to each described nickel manganese cobalt spinel ferrite manufacture method in the claim 1 to 5, it is characterized in that described humidification mixing step is to carry out 45 hours to 50 hours with ball milling (ball mill).
7. according to each described nickel manganese cobalt spinel ferrite manufacture method in the claim 1 to 5, it is characterized in that the step of dry described mixture powder is under 110 ℃ to 130 ℃ conditions, dry 11 hours to 13 hours.
8. according to each described nickel manganese cobalt spinel ferrite manufacture method in the claim 1 to 5, it is characterized in that thermal treatment for the first time is to carry out in the described heat treatment step under 750 ℃ to 850 ℃ conditions.
9. nickel manganese cobalt spinel ferrite manufacture method according to claim 8 is characterized in that, after the described thermal treatment first time, carries out the thermal treatment second time under 1150 ℃ to 1250 ℃ conditions.
10. nickel manganese cobalt spinel ferrite manufacture method according to claim 8 is characterized in that, after the described thermal treatment first time, carries out the thermal treatment second time under 1050 ℃ to 1150 ℃ conditions.
11. nickel manganese cobalt spinel ferrite manufacture method according to claim 9 is characterized in that, after the described thermal treatment second time, carries out thermal treatment for the third time under 1200 ℃ to 1300 ℃ conditions.
12. nickel manganese cobalt spinel ferrite manufacture method according to claim 10 is characterized in that, after the described thermal treatment second time, carries out thermal treatment for the third time under 1100 ℃ to 1200 ℃ conditions.
13. a nickel manganese cobalt spinel ferrite is characterized in that, according to each described method manufacturing in the claim 1 to 5.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2008-0079133 | 2008-08-12 | ||
| KR20080079133 | 2008-08-12 | ||
| PCT/KR2009/004441 WO2010018955A2 (en) | 2008-08-12 | 2009-08-10 | Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102105417A true CN102105417A (en) | 2011-06-22 |
Family
ID=41669450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801294442A Pending CN102105417A (en) | 2008-08-12 | 2009-08-10 | Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20110147643A1 (en) |
| EP (1) | EP2327674A4 (en) |
| JP (1) | JP2011529436A (en) |
| KR (1) | KR101045781B1 (en) |
| CN (1) | CN102105417A (en) |
| WO (1) | WO2010018955A2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101547972B1 (en) * | 2014-01-09 | 2015-08-27 | 주식회사 이엔드디 | Manufacturing method for Ni-Co-Mn composite precursor |
| KR102079734B1 (en) * | 2017-01-26 | 2020-02-20 | 주식회사 엘지화학 | Ferrite catalyst for oxidative dehydrogenation, method for preparing the same and method of preparing butadiene using the same |
| CN109267114B (en) * | 2018-10-22 | 2020-08-21 | 中国科学院金属研究所 | Preparation method of cobalt-manganese spinel coating |
| DE112019005752T5 (en) | 2018-11-15 | 2021-07-29 | Rogers Corporation | High frequency magnetic foils, method of production and their use |
| CN113994443A (en) | 2019-07-16 | 2022-01-28 | 罗杰斯公司 | Magneto-dielectric material, method for producing same and use thereof |
| US11679991B2 (en) | 2019-07-30 | 2023-06-20 | Rogers Corporation | Multiphase ferrites and composites comprising the same |
| TW202116700A (en) | 2019-09-24 | 2021-05-01 | 美商羅傑斯公司 | Bismuth ruthenium m-type hexaferrite, a composition and composite comprising the same, and a method of making |
| US11783975B2 (en) | 2019-10-17 | 2023-10-10 | Rogers Corporation | Nanocrystalline cobalt doped nickel ferrite particles, method of manufacture, and uses thereof |
| CN115136261A (en) | 2020-02-21 | 2022-09-30 | 罗杰斯公司 | Z-type hexagonal ferrite with nanocrystalline structure |
| CN113045304A (en) * | 2021-03-25 | 2021-06-29 | 桂林电子科技大学 | Ferrite wave-absorbing material with mixed spinel structure and preparation method thereof |
| CN113548873B (en) * | 2021-08-13 | 2022-07-29 | 新乡学院 | Preparation method of manganese cobalt oxide ceramic material |
| WO2024190358A1 (en) * | 2023-03-10 | 2024-09-19 | 戸田工業株式会社 | Ferrite powder and resin composition including same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4282302A (en) * | 1978-10-27 | 1981-08-04 | TDK Electronics, Ltd. | Ferrite powder type magnetic toner used in electrophotography and process for producing the same |
| JPS59121804A (en) * | 1982-12-27 | 1984-07-14 | Hitachi Metals Ltd | High-frequency magnetic material |
| JPH10270231A (en) * | 1997-03-25 | 1998-10-09 | Kawasaki Steel Corp | Mn-ni ferrite material |
| CN1706011A (en) * | 2003-02-25 | 2005-12-07 | Tdk株式会社 | Ferrite magnet powder, sintered magnet, bond magnet and magnetic recording medium |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL272060A (en) * | 1960-12-06 | |||
| JPS54150360A (en) * | 1978-05-19 | 1979-11-26 | Tdk Corp | Manufacture of magnetic powder |
| US4247500A (en) * | 1979-12-07 | 1981-01-27 | Bell Telephone Laboratories, Incorporated | Fabrication of ferrite material |
| JPH10279312A (en) * | 1997-03-31 | 1998-10-20 | Tdk Corp | Spinel type ferrite |
| JPH1124305A (en) * | 1997-07-02 | 1999-01-29 | Tdk Corp | Magnetic oxide powder for toner and magnetic toner |
| CN1196651C (en) * | 2000-08-21 | 2005-04-13 | Tdk株式会社 | Ferrite material |
| JP3635016B2 (en) * | 2000-08-21 | 2005-03-30 | Ｔｄｋ株式会社 | Ferrite material |
| JP3939086B2 (en) * | 2000-10-10 | 2007-06-27 | Ｔｄｋ株式会社 | Magnetic material, coil component using the same, and method of manufacturing magnetic material |
| JP2002298333A (en) * | 2001-03-29 | 2002-10-11 | Fuji Photo Film Co Ltd | Method for manufacturing hexagonal ferrite and magnetic recording medium using the same |
| JP2004123404A (en) * | 2002-09-30 | 2004-04-22 | Toda Kogyo Corp | Spinel ferrite sintered compact for high-frequency band, spinel ferrite particle powder and green sheet using the same |
| AU2003304097A1 (en) * | 2003-05-07 | 2004-11-26 | Meiji University Legal Person | Spinel type ferrimagnetic powder and magnetic recording medium |
| JP2005109191A (en) * | 2003-09-30 | 2005-04-21 | Meiji Univ | Spinel ferrimagnetic powder and magnetic recording medium including it |
| JP2005314176A (en) * | 2004-04-30 | 2005-11-10 | Toda Kogyo Corp | Spherical ferrite particle and its manufacturing method, and magnetic carrier for electrophotographic development consisting of spherical ferrite particles |
| JP4687136B2 (en) * | 2005-02-18 | 2011-05-25 | 戸田工業株式会社 | Method for producing spinel ferrimagnetic particles |
| US20060188755A1 (en) * | 2005-02-23 | 2006-08-24 | Meiji University Legal Person | Spinel-type ferrimagnetic particles process for producing the same, and magnetic recording medium using the same |
| US7919007B2 (en) * | 2005-12-19 | 2011-04-05 | Tdk Corporation | Ferrite magnetic material |
| JP2008127222A (en) * | 2006-11-17 | 2008-06-05 | Matsushita Electric Ind Co Ltd | Oxide magnetic material and antenna element and impedance element using the same |
-
2009
- 2009-03-05 KR KR1020090018697A patent/KR101045781B1/en not_active IP Right Cessation
- 2009-08-10 US US13/058,835 patent/US20110147643A1/en not_active Abandoned
- 2009-08-10 WO PCT/KR2009/004441 patent/WO2010018955A2/en active Application Filing
- 2009-08-10 EP EP09806817A patent/EP2327674A4/en not_active Withdrawn
- 2009-08-10 JP JP2011521054A patent/JP2011529436A/en active Pending
- 2009-08-10 CN CN2009801294442A patent/CN102105417A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4282302A (en) * | 1978-10-27 | 1981-08-04 | TDK Electronics, Ltd. | Ferrite powder type magnetic toner used in electrophotography and process for producing the same |
| JPS59121804A (en) * | 1982-12-27 | 1984-07-14 | Hitachi Metals Ltd | High-frequency magnetic material |
| JPH10270231A (en) * | 1997-03-25 | 1998-10-09 | Kawasaki Steel Corp | Mn-ni ferrite material |
| CN1706011A (en) * | 2003-02-25 | 2005-12-07 | Tdk株式会社 | Ferrite magnet powder, sintered magnet, bond magnet and magnetic recording medium |
Non-Patent Citations (2)
| Title |
|---|
| A. PADURARU ET AL.: ""MAGNETIC PROPERTIES OF SOME PERMINVAR FERRITES"", 《JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS》 * |
| K. PARK ET AL.: ""electrical properties of Ni-Mn-Co-(Fe) oxide thick-film NTC thermistors prepared by screen printing"", 《JOURNAL OF MATERIALS SCIENCE: MATERIALS IN ELECTRONICS》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010018955A2 (en) | 2010-02-18 |
| KR20100020412A (en) | 2010-02-22 |
| KR101045781B1 (en) | 2011-07-04 |
| WO2010018955A3 (en) | 2010-07-01 |
| JP2011529436A (en) | 2011-12-08 |
| EP2327674A4 (en) | 2011-12-07 |
| EP2327674A2 (en) | 2011-06-01 |
| US20110147643A1 (en) | 2011-06-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102105417A (en) | Method for producing nickel manganese cobalt spinel ferrite having low permeation loss, and nickel manganese cobalt spinel ferrite produced by same | |
| Thakur et al. | Recent advances on synthesis, characterization and high frequency applications of Ni-Zn ferrite nanoparticles | |
| Angadi et al. | Effect of Sm3+–Gd3+ on structural, electrical and magnetic properties of Mn–Zn ferrites synthesized via combustion route | |
| Mallick et al. | Magnetic properties of cobalt substituted M-type barium hexaferrite prepared by co-precipitation | |
| Peng et al. | Microwave-absorbing characteristics for the composites of thermal-plastic polyurethane (TPU)-bonded NiZn-ferrites prepared by combustion synthesis method | |
| Shepherd et al. | Magnetic and structural properties of M-type barium hexaferrite prepared by co-precipitation | |
| Ramesh et al. | Nanocrystalline gadolinium iron garnet for circulator applications | |
| Manjunatha et al. | Exploring the structural, dielectric and magnetic properties of 5 Mol% Bi 3+-substituted CoCr 2 O 4 nanoparticles | |
| Ramesh et al. | Microstructural and magnetic behavior of mixed Ni–Zn–Co and Ni–Zn–Mn ferrites | |
| Thakur et al. | Novel magnetodielectric nanomaterials with matching permeability and permittivity for the very-high-frequency applications | |
| Singh et al. | Ultrasonically assisted solvohydrothermal synthesis of nanocrystalline Zn-Ni ferrite advanced material for EMI shielding | |
| Sharma et al. | Synthesis, structural, optical, electrical and Mössbauer spectroscopic studies of Co substituted Li0. 5Fe2. 5O4 | |
| Liu et al. | Synthesis and microwave absorbing properties of La-doped Sr-hexaferrite nanopowders via sol–gel auto-combustion method | |
| Angadi et al. | Effect of Sm3+-Gd3+ co-doping on dielectric properties of Mn-Zn ferrites synthesized via combustion route | |
| CN100480187C (en) | Nickel zinc ferrite material and preparation method thereof | |
| Yuan et al. | Microwave adsorption of Sr (MnTi) xFe12− 2xO19 particles | |
| Wang et al. | Synthesis of Cu-modified Co2Z hexaferrite with planar structure by a citrate precursor method | |
| Junaid et al. | Structural elucidation and dielectric behavior evaluation of Dy–Ni substituted manganese ferrites | |
| Pei et al. | Structure and magnetic properties of Ni0. 5Zn0. 5Mn0. 5-xMoxFe1. 5O4 ferrites prepared by sol-gel auto-combustion method | |
| Xueyun et al. | Improved cut-off frequency in Gd/La doped NiZnCo ferrites | |
| Fu et al. | Li0. 5Fe2. 5− xMnxO4 ferrite sintered from microwave-induced combustion | |
| Singh et al. | A systematic study of physical properties of La substituted Sr3Co2Fe24O41 Z-hexaferrites | |
| CN103214037A (en) | Self-assembly rod-shaped manganese-zinc ferrite magnetic material and preparation method thereof | |
| Lodhi et al. | Structural, magnetic and dielectric properties of Dy-Co substituted Sr-Ba-Mg-based magnetic oxides | |
| Wu et al. | Sol–gel auto-combustion synthesis of Ni0. 5Zn0. 5Fe2O4/(SiO2) x (x= 10, 20, 30 wt.%) nanocomposites and their characterizations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110622 |